Etymologies

Middle English, from Old English twēntig; see dwo- in Indo-European roots.

(American Heritage® Dictionary of the English Language, Fourth Edition)

From Middle English, from Old English twentiġ, from Proto-Germanic *twaintigaz, *twai tigiwiz, an old compound of *twain-/*twai (see two) and *-tigaz/*teguz. Compare West Frisian tweintich, Dutch twintig, German zwanzig, Danish tyve. (Wiktionary)

Examples

The calculation from the Valdez base should, however, be taken into consideration in making this barometric determination, and the mean of the two results, twenty thousand six hundred and ninety-six feet, or, roundly, _twenty thousand seven hundred feet_, is offered as the contribution of this expedition toward determining the true altitude of the mountain.

Larry defended his title twenty consecutive times (all-in-all, fighting a total of twenty-six title bouts throughout his career) and held the record for forty-eight straight wins, next to boxing legend Rocky Marciano.